Inking mechanism for printing-machines.



J. C. PUGH. INKING NIEcHANIsII/I FOR PRINTING MACHINES.

APPLICATION FILED APR.14| 19|?.

Patented Oct. 16, 1917.

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A I IIIIIII IIIIIIII IIIIIIII I J. C. PUGH.

INKING IvIECIIANIsI/I FOR PRINTING MACHINES.

APPLICATION FILED APR. I4, I9I7.

1,243,341 Patented Oct. 16, 1917.

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" En sTETEs EETENT oEEToE.

JOHN CHARLES PUGH, orY LONDON, ENGLANn, .AssIGNOHOF ,ONE-HALE TO WHITE- HEAD, MORRIS sa COMPANY, LIii/rrfrnri,v or LONDON, ENGLAND.

INKING MEOHANISM FOR PRINTYIING-MAOHINES.

Application filed April 14, 1917. Serial N o. 162,082.

To all whom t may concern.' 'Y

Be it known that I, JOHN CHARLES PUGH, a subject of the Kin of Great Britain, residing at Vhitehea Morris. & Company Liiniteds Printing l/Vorks, Tower HillLondon, England, have invented new and useful Improvements in Inking Mechanism for Printing-h/Iachines, of which the following is specification.

This invention relates to inking mecha- 1 nism for letter-press printing machines and has for its object to provide means whereby fluid ink, such as ordinary writing ink, may be applied to 'a printing surface, as described, for instance, in the specification of British Letters Patent No. 1044, A. D. 1914.

In practice the use in a letterpress printing machine of fluid ink, that is to say, an ink such as ordinary writing ink, to which no thickening has been added, has heretofore been considered almost impossible owing to the difficulty of applying sufficient ink to produce a good impression without at the same time supplying an eXcess of ink. As the result of numerous experiments, I have discovered that if I employ in conjunction with an ink fountain or trough a pair of accurately contacting rollers which are driven at a constant and uniform speed, one of which dips into the ink, While the other serves as a regulating supply roller, and if, in addition, I employ a vibrator roller for transferring the ink from the Operating roller directly to an inking bed, such vibrator roller being covered with an absorbent material, a most even distribution of ink can be obtained, and this invention, therefore, consists in such an arrangement.

In the accompanying drawing- Figure l is a front view showing the inking mechanism in connection with so much of a printing machine as is necessary to illustrate the invention, and

Fig. 2 is a side elevation of the same.

In these figures a indicates the framing of the printing machine and b an inking slab from which the ink is conveyed to the printing surface in the ordinary manner.

The inking mechanism comprises two rollers c, CZ carried on shafts c1, Z1 mounted in brackets e, e on the frame. The roller c, which I term the fount roller, is arranged over a trough f of porcelain or other material which will not be injured in any way by the ,ink or cause injury to the latter, the

rotates, it will dip into the ink and be wetted thereby. The roller d, which I term the regulating supply roller, runs in contact with the roller c, the shafts of the two rollers being geared together, for instance, as indicated at g, g to move in unison and constantly driven, so that the ink which the fount roller takes up from the trough 7 will be evenly applied to the regulating vsupply roller d.l In order to provide for adjusting the pressure between the two rollers and consequently also the feed, I make the bearings h, la in which the shaft d1 is carried, adjustable, for instance, by means of screws z', i whereby very accurate adjustment can be obtained.

In connection with the regulating supply roller d I arrange what is termed a vibrator that is to say, a roller 7c mounted in bearings upon oscillating arms Z, Z the movement of which is controlled by a cam or other device, not shown, in such a manner that the said vibrator is alternately moved from the position indicated in the dotted lines in Fig. 2, in which it is in contact with the regulating supply roller d, to a position indicated in full lines in the said Fig. l, in which it will come into contact with the inking slab b as the latter reciprocates be-` neath it, and transfer ink to it. This inking slab is preferably composed of glass or other material which will not act injuriously upon the ink and travels beneath the said vibrator and also beneath waver rollers, not shown, by means of which the ink is distributed and then conveyed to the printing surface.

In practice the fount roller c and regulating supply roller el are preferably composed of hard rubber, or faced with hard rubber, while the vibrator is is faced with absorbent material such as felt or a smooth surfaced woven fabric. The waver rollers are preferably composed Of printers roller composition cased in rubber, although for some classes of work printing is greatly improved by the employment of absorbent waver rollers.

The improved printing mechanism is particularly suitable for printing checks for the prevention of fraud.

Claim:

Inking mechanism for letterpress printing machines using fluid ink, such as ordinary 4Specification of Letters Patent, Patented ,0015, 16, 1917s, y

.saidiroller being arranged so that, as it .Q A Y y 1,243,341

Writing ink, com-prising fountain roller a covering` of absorbent Inaterial upon the and a regulating supply roller running'n said Vibrator roller, substantially Vas -de ,lo accurate contactivith one another. and which scribed. I v

are constantlyand 'uniformly driven, a *T i trough for containing vinto which the v -v Y CHARLES PUGH' fountain roller Will dip, an inking bed, af Y Witnesses:

vibrator rollenfor transferring ink from .5 JorrN E. BOUSFIELD, the regulating roller to the inking bed andv A. ALBUTT.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of llatents,

` Washington, D. C. Y i Y a V- s 

